Process for treating carbon from cracking stills



March 12, 1929- G. EGLOFF Er AL i A 13051179 PROCESS FOR TREATING CARBONFROM CRACKING' STILLS Original Filed April 2-3. 1921 2 Sheets-Sheet l 2Sheets-Sheet 2 G. EGLOFF ET AL mfmuuuu'ly Original Filed April 23, 1921March 12, 1929.

PRocEss FOR TREATING CARBON FROM cRAcKING srrLLs bw Em www .Sw WW\ .wwwSY .wm

Patented Mar. 12, H929.

UNITED STATES PATENT OFFICE.

GUSTAV EGLOFF AND HARRY P. BENNEB, OF INDEPENDENCE, KANSAS, ASSIGNORS T0SOUTH DAKOTA.

OIL PRODUCTS COMPANY ,`0F GHICAGO, ILLINOIS, A CORPORATION OF PROCESSFOB TBEATING CARBON FROM CRACKING STILI-S.

Application led April 23, 1921, Serial No. 463,938. Renewed February 20,1928.

This invention relates toimprovements in process and apparatus forcracking o1 l, and refers more particularly to the cracklng of petroleumoil, to convert substantial percentages thereof to light hydro-carbons,such as gasolene or gasolene-like bodies. T he particularly novelfeature of this 1nvent1on consists in the manner ofy handling theresidual products produced from the cracking reaction, so that the heavyliquid constituents thereof are removed from the carbon constituents ofthe residual products.

The invention will more clearly appear from the accompanying drawingsand description thereof, in which Fig. 1 is a view partly in Sideelevation and partly in vertical section of our improved apparatus; andFig. 2 is an enlarged view partly in vertical section and partly in sideelevation of that portion of the apparatus in which the residue from thecracking still is treated.

Referring to the drawings, 1 designates the furnace, provided withburner 2, stack 3, combustion space 4. In the combustion space thefurnace is mounted with the heating element oreracking coil 5, which maytake the form of a continuous length of sixinch pipe. The inlet side ofthe coil is connected by feed line 6 and throttle valve 7to the chargingpump 8. The discharge side of the coil is connected with transfer line9` throttle valve 10, to one end of an elongated expansion chamber 11,located outside of the fire zone, and, in the present instance, takingthe form of a large horizontally disposed cylindrical shell. The vaporspace of the expansion chamber 11 is provided with vapor outlet pipe 12,extended as shown at 13, into the lower end of a vertical dephlegmatoror a reflux condenser 14. The extension 13 is provided with a spaced capmember 15, the arrangement being such as to permit the vapors to enterthe dephlegmator while preventing the reflux condensate from fallingv24. This receiver 24 is provided with liquid level gauge 25, pressuregauge 26, draw oi pipe 27 controlled by throttle valve'28, gas outletpipe 29, controlled by throttle Valve 30. The arrangement is such that auniform pressure may be maintained in the entire system, or adifferential pressure may be maintained on various parts of the system,by regulating the valves shown.

Referring now to the manner of handling the carbon precipitated in theexpansion chamber at the time the oil is vaporized, the lower end of thechamber 11 is provided with residue draw off pots or conduits 31,controlled by throttle valves 32. Mounted directly beneath the draw ofi'conduits 31 is a track 33, on which rides a car 34 for receiving thecarbon containing residue from the expansion chamber. The carbon isdrawn off from the conduits 31 into the car 34 after the run iscompleted. The liquid residue may be intermittently or continuouslydrawn oil' through residue vpipe 35a, controlled by throttle valve 36.At the end of the run, the expansion chamber may be one-half totwothirds full of oil soaked carbon which is ldrawn off through theconduits 31 into the with an extension 44', which is connected to adriving pulley 46, leading to any suitable source of power, whereby theshell member 39 may be slowly rotated. The stationary end 38 is providedwith a carbon draw off pipe 47, controlled by valve 48, and adapted todeliver the carbon to suitable car 49. The distillates are removed fromthe residue treating still through the vapor pipe 50, controlled bythrottle valve 51, and leading to any suitable condenser and receiver(not shown).

The still is internally heated by means of the pipe 52, provided at oneend with a burner 53, and the other end connecting to suitable stack,(not shown). In order to more effectively, mechanically break up thecarbon into a line state of division, we preferably provide the rotatingmember 39 with a plurality or series of steel balls or the like 5l.which balls may be prevented from passing out through the pipe 4Tthrough suitable stop in the stationary member 3S.

ln carrying out the process the oil is continuously fed to the heatingcoil 5 and delivered in substantially liquid phase to the eX- pansionchamber. where vaporization takes place, and the carbon is precipitated.The generated vapors are passed to the dephlegp mator, the heavierportions condensed and returned as rclux condensate to the heating coilfor further treatment. while the uncondensed portions pass` out to thelinal condenser and receiver. As the run proceeds, oil soaked carbonWill accumulate in the expansion chamber until the expansion chamber maybe from a half to two-thirds full, at which time it- Will probably bedesirahle to shut the plant down in order to clean out the expansionchamber. At this time, the oil soaked carbon is drawn otf through theconduits 31, delivered to the car 34, to the hopper 35, and thence tothe still 36. There the carbon is heated and distilled at atmosphericpressure, the carbon being heated to a Sullicient temperature to driveoff the liquid portions of the residue. The liquid distillate obtainedfrom distilling this oil soaked carbon may be used as fuel, orre-cracked, 0r otherwise disposed of. The dry carbon can be used forsuch purposes as carbon electrodes, or may be activated or may be usedfor filler in automobile tires and may be used tor inks and other uses.

Itis to be understood that during the cracking operation, the crackingapparatus may be maintained under any desired vapor pressure either fromthe still to the receiver, or a differential pressure may he maintainedin various parts of the system.

lVe claim as our invention:

l. A process for treating oil soaked carbon produced in an oil crackingoperation coniprising charging a Still With a quantity otl such oilsoaked carbon, subjecting said car bon to a heat treatment sutlicient todistill oli' all the liquid constituents thereof by applying the heatcentrally of .said still to cause the heat to radiate through said oilsoaked carbon. and continuously agitating such carbon adjacent the wallsof said still while undergoing said heat treatment.

2. A process of treating oil soaked precipitated carbon formed during anoil cracking operation consisting in chargingr a still with a quantityof such carbon, in subjecting the carbon to a heat treatment by applyingheat centrally of the body of oil soaked carbon in said still to radiatethrough said carbon and in continuously agitating the carbon in thecoolest zone of the still while under an atmospheric pressure, in takingolf the liquid constituents of said carbon as vapor from said still, incondensing and collecting such vapors and in discharging the dry carbonfrom the still.

GUSTAV EGLOFF. y HARRY P. BENNER.

